Lifting-jack



(No Model.)

H. H. GLEVER.

LIFTING JACK.

No. 408,873. Patented Aug. 6, 1889..

. mfy/Woye UNITED STATES PATENT HENRY H. CLEVER, OF CLEVERSBURG,PENNSYLVANIA.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent No. 408,373, dated August6, 1889.

i Application flied December 27, 1888. Serial No.294,780. (No model.)

To all whom ib may concern.-

Beit known that I, HENRY H. CLEVER, a citizen of the United States,residing at Cleversburg, in the county of Cumberland and Stat-e ofPennsylvania, have invented certain new and useful Improvements inLiftingJacks; and l do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters and figuresof reference marked. thereon, which form a part of this speciiication.

My invention has relation to improvements in lifting-jaeks of that classor style denominated lever lifting-jacks; and the object is to improveexisting devices of the kind named, and especially the mechanicalconstruction and arrangement of that certain lifting-jack shown anddescribed in Letters Patent No. 398,858, dated November 27, A. D. 1888,granted to me.

I have fully illustrated my improved liftingjack in the accompanying"drawings, wherein- Figure 1 is a perspective of the device. Fig. 2 is aperspective `of the device taken from the reverse of Fig. 1. Fig. 3 is avertical section of the standard and crosssccti'on of the cross-head orhousing on top of the standard.

Reference being had to the drawings, A denotes the standard of thelifting-jack,\vhich is provided with a base plate or piece 1, of suchdimensions as to sustain the lifting-jack in an upright position. Thestandard is formed with racks 2, having the steps or notches formed withhorizontal upper faces, substantially as shown, to serve as substantialstops or rests for the turned-in ends of the lifting-bars. The standardis formed with a central hole 3, which receives the guide-rod connectedto the lever-head. On the top of the standard is a casing or housing 11,having vertical ways or passages 5 to take the reciprocable lifting-barsand guide them in their up and down movements. To the ends of the easing4 are secured springs 6, which extend downward yand are arranged topress inward and keep the ends of the lifting-bars engaged with theracks of the standard. The

ways 5 are made longer than thewidth of the lifting-bars to permit thelatter to have inward and outward movement as they lift over the stepsof the racks.

B denotes the lifting bars or rods arranged in the vertical ways of thecasing and turned inward at their lower ends, as at 7, to engage theracks and set with their end faces on t-he steps of the racks,substantially as shown in the drawings. At the upper ends theliftingbars are pivotally connected to the operatinglever@ by bolts o.For this purpose the upper ends of the lifting-rods are bifurcated orformed with seats to receive the lever, and bolts are projected throughthe parts to secure them together, as shown in Figs.. 1 and 2 of thedrawings.

In the hole 3 in the center of the standard is arranged a guide-rod 8,which has its upper end pivotally connected to the operating-leverbetween the connections of the liftingbars, as shown. This guide-barserves to keep the lifting-levers and the standard in alignment whilethe machine is in use.

On the top of the operating-lever is mounted a weight-block 9, which isconnected to the lever by a bolt 10, and is arranged in its seat to havea slight rocking function to provide for any variance in the relation ofthe weight to the standard.

The standard is formed with a guide-flange 11 on one side, and anauxiliary lifting-bar 12, having a guide-loop 13, rests on thisguideiiange 11, the said lifting-bar having one end arranged in a groovelet on the weight-block and bolted thereto, while the lower end isformed with a foot 15. This lifting-bar 12 can be used to engage andlift weights which are too low down to be engaged and lifted by theupper weight-block.

On the operating-lever is fulcrumed abellcrank lever-16, to theweight-arm of which is connected a rod 17, having its lower endconnected to two short rods 18 19, which in turn have their lower endsconnected to the lower ends of the respective lifting-bars. The otherarm of the bell-crank lever is connected to a rod 20, and the other endof the rod is conneeted to a hand-lever 21, fulcrumed on theoperating-lever. By drawing up the hand end of the lever 21 the rods 1819 operate to spread the lower ends of the lifting-rods and IOOdisengage them from the racks, so that they may be lowered 011 thestandard as desired, and carry with them the elements of the deviceconnected to them.

If a weight is upon the machine, it may be lowered by moving theoperating-lever in a direction to loosen one of the lifting-rods fromits seat on the step of the rack, and then drawing up the hand-lever,which operates to throw the lifting-rod outward, when theoperating-lever can be moved to let that lifting-rod down to the nextstep of the rack. A similar movement of levers in succession willeventuate in moving the other lifting-rod downward, and by successivesimilar movements the burden can be let down as far as the limit of themachine.

Having thus described the construction of my improvements and explainedthe principle and operation thereof, I proceed to particularly point outand distinctly claim the parts, improvements, and combination which Iclaim as my invention, to wit:

l. The combination of the, standard A, having a base-piece and formedwith racks 2 on its side edges, and a vertical central hole 3, andprovided with a casing 4, having vertically-arranged ways therein, theoperatinglever C, having a pivotally-attached weightblock mountedthereon, the lifting-bars B, connected to the operating-lever andprojected through the ways in the casing of the standard, with theirlower ends formed and arranged to engage the racks of the standard, aguide-rod 8, connected to the operating-lever and arranged in thevertical hole of the standard, and springs 6 on the casing to press thelifting-bars in the racks, substantially as described.

2. The combination of the standard A, having a base-piece, and formedwith racks on its edges and a vertical hole 3, and a casing 4 mountedthereon, having vertical ways, the operating-lever C, having apivotally-attached weight-block mounted thereon, the lifting-bars B,connected to the operatinglever and projected through the ways of thecasing, with their lower ends formed and arranged to engage the racksofthe stan dard, a guide-rod connected to the operating-lever andarranged in the vertical hole of the' standard, springs on the casing topress the lifting-rods in the racks, a bell-crank lever fulcrumed to theoperating-lever, having one end connected to a rod provided withspreading-bars at its lower end, said spreading-bars being connected tothe lower ends of the lifting-bars, and the other end of the bell-cranklever being connected to a hand-lever, substantially as described.

3. The combination, with the standard having racks on its edges, thelifting-rods arranged in engagement with said racks, and theoperating-lever, of levers to disengage the lower ends of thelifting-bars from the racks, consisting of a hand-lever fulcrumed to theoperating-lever, a bell-crank lever fulcrumed to the operating-lever andhavingV one end connected to the hand-lever, a connecting-rod jointed tothe bell-crank lever, and two spreading-bars pivotally fastened to thelower end of the connecting-rod and their other ends fastened to theends of the lifting-rods.

4. The combination of the standard, formed with racks on its edges andhaving a casing with vertical Ways on its upper end and a guide-ange onits side, the lifting-bars arranged in the ways of the casing to engagethe racks with their lower ends, the operating-lever fulcrumed to thelifting-rods, and the auxiliary lifting-rod connected to theoperating-lever and formed with a foot and provided with a guide-pieceto engage the guide-flange on the standard, substantially as described.

5. The lifting-jack herein described, Colnposed of the standard formedwith racks on its edges, a central vertical hole, anda guideiange on itsside, a casing having ways to receive the lifting-rods and provided withsprings to press the lifting-rods in engagement with the racks on thestandards, the operating-lever fulcrumed to the lifting-rods, aweight-block on the operating-lever, the levers, substantially asdescribed, to engage the lifting-bars from the racks, a guide-rodconnected to the operating-lever and arranged in the hole of thestandard, an auxiliary lifting-rod connected to the operatingleverandprovided with a guide-piece to engage the guide-flange on the standard,all arranged and combined substantially as de-j scribed, and for thepurposes specified.

In testimony whereof I aiiiX my signature in presence of two witnesses.

HENRY H. CLEVER.

Witnesses:

MATTIE KaLso, W. K. KELso.

IOO

